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1cm = 10mm, so 4cm = 40mm. 1m = 100cm or 1000mm.
It is an equilateral triangle
96 sq. cm
you half the diamater to get the radius, then you square the radius. Then you times it by 3.14. Always. example. Diameter=4cm then radius =2cm squared=4cm 4x3.14=12.56
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